CN109724912A - It is a kind of quickly to measure sulfate ion depth of invasion test method in regeneration concrete test specimen - Google Patents
It is a kind of quickly to measure sulfate ion depth of invasion test method in regeneration concrete test specimen Download PDFInfo
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- CN109724912A CN109724912A CN201910130803.1A CN201910130803A CN109724912A CN 109724912 A CN109724912 A CN 109724912A CN 201910130803 A CN201910130803 A CN 201910130803A CN 109724912 A CN109724912 A CN 109724912A
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- sulfate ion
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- invasion
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Abstract
The invention discloses sulfate ion depth of invasion test methods in a kind of quickly measurement regeneration concrete test specimen, and the test method is the following steps are included: calibration metabisulfite solution standard curve；Fit standard solution curvilinear equation；Regeneration concrete test specimen is sliced and is clayed into power；The solution absorbance prepared using spectrophotometric determination test specimen powder；Absorbance will be measured and substitute into standard solution curvilinear equation calculating sulfate ion content, to define sulfate ion depth of invasion.The test method rapid and convenient, it is simple and reliable, have a extensive future, influenced by outside environmental elements it is small, can quantization signifying sulfate ion invade regeneration concrete test specimen depth.
Description
Technical field
The present invention relates to measurement regeneration concretes by sulfate attack degree technical field, and in particular to a kind of quickly measurement
Sulfate ion depth of invasion test method in regeneration concrete test specimen.
Background technique
Concrete structure is inevitably corroded by extraneous sulfate medium during long service, sulfate ion
It is reacted with hydrolysis product of cement and generates dilatancy corrosion product, expanded concrete, cracking destruction, seriously affect concrete
Safety of structure and service life.Compared with normal concrete, regeneration concrete causes it by sulphur because of its raw material compositing characteristic
Hydrochlorate erosion degree is more serious.
Compared with natural aggregate, recycled aggregate inferior quality (multi-angular, water absorption rate is big, voidage is high etc.)；And Regenerated Bone
The presence of material attachment old sand slurry makes inside concrete form multiple weak boundary structure (the old mortar interface of old aggregate-, old aggregate-
New mortar interface, new aggregate-new mortar interface etc.), further increase a possibility that sulfate ion invades inside concrete
And depth of invasion.At present about measurement concrete sample by sulfate attack degree test method Primary Reference " chemistry of cement point
Analysis method " (GB/T 176-2008) barium sulfategravimetry (basic taper method), with SO inside the concrete sample of measurement3Measure approximate table
It levies test specimen and invades sulfate ion amount.However, this method process is cumbersome, measuring accuracy is poor, and fail to embody sulfate ion
Concrete sample depth is invaded, therefore proposes that one kind quickly measures sulfate ion depth of invasion test side in regeneration concrete test specimen
Method is highly desirable.
Summary of the invention
It is insufficient by sulfate attack degree measuring method the invention aims to solve existing measurement regeneration concrete test specimen
Place provides one kind and quickly measures sulfate ion depth of invasion test method in regeneration concrete test specimen.
In order to solve the above technical problems, the technical scheme adopted by the invention is as follows: a kind of quickly measurement regeneration concrete test specimen
Middle sulfate ion depth of invasion test method, comprising the following steps:
Step 1: calibration metabisulfite solution standard curve.1.4786g anhydrous sodium sulfate is weighed with assay balance, is dissolved in a small amount of pure
Water purification is simultaneously settled to 1000ml, the 1.00ml solution sulfate ion containing 1.00mg.Take 0.00 respectively, 0.25,0.50,
1.00,1.50,2.00,2.50,3.00,4.00,6.00,8.00 and 10.00ml sulfate standard solution, is added separately to
50ml colorimetric cylinder, adds distilled water to be settled to 25ml, adds the hydrochloric acid 2.5ml of 2.5mol/l, adds Bacl2- PVA mixed liquor
10ml, is settled to 50ml again, mixes and places 5min immediately, be put into cuvette and measure sulfate ion content, with sky
White reagent does reference measurement；
Step 2: fit standard curvilinear equation.According to solution absorbance and corresponding sulfate ion content, calibration curve fitting side
Journey is as follows:
f x=12.627abs 2+2.686abs+0.024
In formula:f x For sulfate ion content；absFor solution absorbance.
Step 3: preparation slice takes out slice after regeneration concrete test specimen is immersed in 5% metabisulfite solution certain age.
Wherein, five faces of regeneration concrete test specimen are uniformly smeared with epoxy resin to completely cut off test specimen with metabisulfite solution and contact, and only stay one
A face is corroded by metabisulfite solution；
Step 4: preparing powder.It is taken out after the ready slice of step 3 is dried 48h in 50 DEG C of baking ovens, takes off slice middle part
Position, which is put into ceramic grinding body, is ground to partial size less than 80 μm；
Step 5: the solution absorbance prepared using ultraviolet specrophotometer test test specimen powder.2g step is weighed with assay balance
Rapid 4 powder removes standing for 24 hours with 50ml distilled water immersion, and after vibrating 30min on the oscillator；In then using
Fast filter paper filtering 25ml filtrate is added in colorimetric cylinder；2.5ml 2.5moL/L hydrochloric acid is added into colorimetric cylinder, adds 10ml
Uniformly mixed Bacl2- PVA mixed liquor；Sample is settled to 50ml, plug hand is covered and vibrates 3 times, stand 5min
Then solution absorbance is tested with ultraviolet specrophotometer；
Step 6: calculating solution sulfate ion content.The solution absorbance measured is substituted into metabisulfite solution mark described in step 2
Solution sulfate ion content is calculated in directrix curve；
Step 7: defining sulfate ion depth of invasion.The sulfate ion depth of invasion is to measure sulfate ion content to be
Depth when 0.
Specifically, ultraviolet specrophotometer model DR 6000 described in the step 2；More specifically, solution absorbance is surveyed
Method for testing is carried out according to ultraviolet specrophotometer test procedure.
Specifically, step 3 concrete sample is having a size of 10cm × 10cm × 10cm；More specifically, the concrete
Test specimen slicing mode are as follows: 0 ~ 1cm range averagely cuts four, and 1 ~ 2cm range averagely cuts three pieces, and 2 ~ 3cm range averagely cuts two panels, 3 ~
4cm range cut it is a piece of, 4 ~ 10cm of residue be it is a piece of.It is test specimen and extraneous sulfate ion contact surface at the 0cm.
Compared with prior art, the invention has the following advantages that
1, test method rapid and convenient of the present invention, it is simple and reliable, have a extensive future；
2, the present invention can accurately measure regeneration concrete test specimen by sulfate attack depth, to realize that quantization signifying regenerates coagulation
Soil is by sulfate attack degree；
3, the present invention is by external environment, such as humidity, extraneous acid ion factor influence it is small.
Detailed description of the invention
In order to keep the object, technical solutions and advantages of the present invention distincter, the present invention is made into one with reference to the accompanying drawing
Step is described in detail, in which:
Fig. 1 is metabisulfite solution calibration curve；
Fig. 2 is sulfate ion depth of invasion.
Specific embodiment
The preferred embodiment of the present invention is described in detail with reference to the accompanying drawing.It should be appreciated that preferred embodiment only for
It is best understood from technical solution of the present invention, rather than limiting the scope of protection of the present invention.
It is a kind of quickly to measure sulfate ion depth of invasion test method in regeneration concrete test specimen, comprising the following steps:
Step 1: calibration metabisulfite solution standard curve.1.4786g anhydrous sodium sulfate is weighed with assay balance, is dissolved in a small amount of pure
Water purification is simultaneously settled to 1000ml.At this point, 1.00ml solution sulfate ion containing 1.00mg.Take 0.00 respectively, 0.25,0.50,
1.00,1.50,2.00,2.50,3.00,4.00,6.00,8.00 and 10.00ml sulfate standard solution, is added separately to
50ml colorimetric cylinder, adds distilled water to be settled to 25ml, adds 2.5mol/l hydrochloric acid 2.5ml, adds Bacl2- PVA mixed liquor
10ml is settled to 50ml again, mixes place 5min immediately, be put into cuvette and measure sulfate ion content, with blank
Reagent does reference measurement；
Step 2: fit standard curvilinear equation.Solution sulfate ion calibration curve is shown in Fig. 1, and fit equation is as follows:
f x=12.627abs 2+2.686abs+0.024
In formula:f x For sulfate ion content；absFor solution absorbance.
Step 3: preparation slice takes out slice after regeneration concrete test specimen is immersed in 5% metabisulfite solution 120d.Its
In, five faces of regeneration concrete test specimen are uniformly smeared with epoxy resin to completely cut off test specimen with metabisulfite solution and contact, and only stay one
Face is corroded by metabisulfite solution.Test specimen 0 ~ 1cm range since erosion surface averagely cuts four, and 1 ~ 2cm range averagely cuts three pieces, 2 ~
3cm range averagely cuts two panels, and 3 ~ 4cm range is cut a piece of, and 4 ~ 10cm of residue is a piece of.It is test specimen and extraneous sulfuric acid at the 0cm
Radical ion contact surface；
Step 4: preparing powder.It is taken out after slice described in step 3 is dried 48h in 50 DEG C of baking ovens, takes off slice middle part position
It is put into ceramic grinding body and is ground to partial size less than 80 μm；
Step 5: the solution absorbance prepared using ultraviolet specrophotometer test test specimen powder.2g step is weighed with assay balance
Rapid 4 powder removes standing for 24 hours with 50ml distilled water immersion, and after vibrating 30min on the oscillator；In then using
Fast filter paper filtering 25ml filtrate is added in colorimetric cylinder；2.5ml 2.5moL/L hydrochloric acid is added into colorimetric cylinder, adds 10ml
Uniformly mixed Bacl2- PVA mixed liquor；Sample is settled to 50ml, plug hand is covered and vibrates 3 times, stand 5min
Then solution absorbance is tested with ultraviolet specrophotometer；
Step 6: calculating solution sulfate ion content.The solution absorbance measured is substituted into metabisulfite solution mark described in step 2
Solution sulfate ion content is calculated in directrix curve；
Step 7: defining sulfate ion depth of invasion.The sulfate ion depth of invasion is to measure sulfate ion content to be
Depth when 0.For example, Fig. 2 is shown in regeneration concrete test specimen sulfate ion intrusion distribution in test specimen, it can determine that sulfate ion is invaded
Entering depth is 1.75cm.
Based on the above design and calculation method, the test method can quickly measure in regeneration concrete test specimen sulfate radical from
Sub- depth of invasion.
The present invention is not limited to the above embodiments, on the basis of presently disclosed techniques scheme, those skilled in the art
For member according to disclosed technology contents, some replace can be made to some of which technical characteristic by not needing creative labor
It changes and deforms, these replacements and deformation are within the scope of the invention.
Claims (10)
1. sulfate ion depth of invasion test method in a kind of quickly measurement regeneration concrete test specimen, which is characterized in that including
Following steps:
Step 1: calibration metabisulfite solution standard curve weighs 1.4786g anhydrous sodium sulfate by assay balance, is dissolved in a small amount of
Pure water is simultaneously settled to 1000ml, take 0.00 respectively, 0.25,0.50,1.00,1.50,2.00,2.50,3.00,4.00,
6.00,8.00 and 10.00ml sulfate standard solution is added separately to 50ml colorimetric cylinder, distilled water is added to be settled to 25ml, adds
The hydrochloric acid 2.5ml of 2.5mol/l, adds Bacl2- PVA mixed liquor 10ml, is settled to 50ml again, mixes and place immediately
5min is put into cuvette and measures sulfate ion content, does reference measurement with blank reagent；
Step 2: fit standard solution curvilinear equation, solution sulfate ion content and corresponding solution extinction according to step 1
Degree, fit standard solution quadratic curve equation；
Step 3: test specimen is cut into different-thickness sheet by test specimen slice；
Step 4: preparing powder, taken out after the ready slice of step 3 is dried 48h in 50 DEG C of baking ovens, take off slice middle part
It is partially placed into ceramic grinding body and is ground into powder；
Step 5: the solution absorbance prepared using spectrophotometer test test specimen powder weighs 2g step 4 institute with assay balance
Powder is stated, removes standing for 24 hours with 50ml distilled water immersion, and after vibrating 30min on the oscillator；Then filtered with middling speed
Paper filters 25ml filtrate and is added in colorimetric cylinder；2.5ml 2.5moL/L hydrochloric acid is added into colorimetric cylinder, adds 10ml mixing
Uniform Bacl2- PVA mixed liquor；Sample is settled to 50ml, plug hand is covered and vibrates 3 times, stand 5min then
Solution absorbance is tested with spectrophotometer；
Step 6: calculating solution sulfate ion content, the solution absorbance measured is substituted into metabisulfite solution mark described in step 2
Solution sulfate ion content is calculated in directrix curve；
Step 7: defining sulfate ion depth of invasion.
2. sulfate ion depth of invasion test side in a kind of quickly measurement regeneration concrete test specimen according to claim 1
Method, which is characterized in that step 2 solution absorbance is measured by spectrophotometer, specifically, spectrophotometer model DR
6000 spectrophotometers；Solution absorbance test method is carried out according to spectrophotometer test procedure.
3. sulfate ion depth of invasion test side in a kind of quickly measurement regeneration concrete test specimen according to claim 1
Method, which is characterized in that fit standard solution curvilinear equation in the step 2 are as follows:
f x=12.627abs 2+2.686abs+0.024
In formula:f x For sulfate ion content；absFor solution absorbance.
4. sulfate ion depth of invasion test side in a kind of quickly measurement regeneration concrete test specimen according to claim 1
Method, which is characterized in that the concrete sample is having a size of 10cm × 10cm × 10cm；More specifically, it is regenerated in the step 3
Concrete sample takes out slice after being immersed in 5% metabisulfite solution certain age, wherein five face rings of regeneration concrete test specimen
Oxygen resin is uniformly smeared to completely cut off test specimen with metabisulfite solution and contact, and a face is only stayed to be corroded by metabisulfite solution.
5. sulfate ion depth of invasion test side in a kind of quickly measurement regeneration concrete test specimen according to claim 1
Method, which is characterized in that regeneration concrete test specimen cutting mode in the step 3 are as follows: 0 ~ 1cm range averagely cuts four, 1 ~ 2cm model
Enclose and averagely cut three pieces, 2 ~ 3cm range averagely cuts two panels, 3 ~ 4cm range cut it is a piece of, 4 ~ 10cm of residue be it is a piece of, be at the 0cm
Test specimen and extraneous sulfate ion contact surface.
6. sulfate ion depth of invasion test side in a kind of quickly measurement regeneration concrete test specimen according to claim 1
Method, which is characterized in that test specimen powder diameter is less than 80 μm in the step 4.
7. sulfate ion depth of invasion test side in a kind of quickly measurement regeneration concrete test specimen according to claim 1
Method, which is characterized in that solution absorbance is tested using ultraviolet specrophotometer in the step 5.
8. sulfate ion depth of invasion test side in a kind of quickly measurement regeneration concrete test specimen according to claim 1
Method, which is characterized in that the step 6 substitutes into the solution absorbance measured in metabisulfite solution standard curve described in step 2, meter
Calculation obtains solution sulfate ion content.
9. sulfate ion depth of invasion test side in a kind of quickly measurement regeneration concrete test specimen according to claim 1
Method, which is characterized in that sulfate ion depth of invasion is defined as measuring solution sulfate ion content in the step 7 when being 0
Depth.
10. sulfate ion depth of invasion test in a kind of quickly measurement regeneration concrete test specimen according to claim 1
Method, which is characterized in that the method can not only measure sulfate ion depth of invasion in regeneration concrete test specimen, can be with
Sulfate ion depth of invasion in any concrete sample under measurement natural environment.
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Cited By (2)
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| CN110376119A (en) * | 2019-07-08 | 2019-10-25 | 东南大学 | A kind of half soak test device of concrete |
| CN110954533A (en) * | 2019-12-13 | 2020-04-03 | 郑州大学 | Method for quantitatively detecting content of ettringite in concrete eroded by sulfate |
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| CN110954533A (en) * | 2019-12-13 | 2020-04-03 | 郑州大学 | Method for quantitatively detecting content of ettringite in concrete eroded by sulfate |
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Application publication date: 20190507 |